Grate-bar



(No Model.)

- T. MAITLAND.

Grate Bar.

No. 234,047. Patented Nov. 2,1880.

Wf WW.

UNITED STATES PATENT OFFICE.

THOMAS MAITLAND, OF WILLIAMSPORT, PENNSYLVANIA.

GRATE- BAR.

SPECIFICATION forming part of Letters Patent No. 234,047, dated November2, 1880.

Application filed September 20, 1880. (No model.)

To all whom it may concern:

Be it known that I, THOMAS MAITLAND, of Williamsport, in the county ofLycomiug and State of Pennsylvania, have invented a new and usefulImprovement in Grate-Bars; and I do hereby declare that the following isa full and exact description of the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention is intended as an improvement upon the grate-bar for whichLu'cian H.

Allen and William Bartow have obtained a patent, numbered 181,892, anddated September 5, 1876 and it consists in the peculiar construction andarrangement of the various parts composing such gratebar, all of whichwill be hereinafter more fully set forth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexed drawings, inwhich-- Figure 1 represents a top view; Fig. 2 a side view, and Fig. 3 atransverse vertical section on the line as 00, Fig. 1, of my improvedgratebar.

In the drawings, a represents the longitudinal bearing-bar, and b thecross bars or ribs which extend at right angles from both sides of thebar a. The cross-bars b at one side of the bearing-bar break joints withthe bars at the other side, and are of strai ght-1ined shape from thebearing-bar to their outer ends, grooved at the top, which is flanged,and extending downward with slightly tapering sides about half the depthof the hearing-bar. The cold air passes around the lower part of thecross-bars and thereby keeps them cold, and thus prevents their warpingand twisting from the intense heat of the fire. The cross-bars aredisconnected from each other at the ends, so as to enable their separateexpansion and contraction.

The bar a has the same width throughout its entire depth, such widthbeing equal to that of the flanged top of the side bars, b. 0n the uppersurface of the bearing bar are grooved spaces 0 between the cross-barsI). These spaces 0 connect directly with the grooves on the top of thecross-bars, which are arranged on the side of the bearing-bar oppositeto such grooved recesses. The object of these grooved recesses c, inconnection with the grooves on top of the flanged cross-bars, is toprovide an easy an d effective way for removing the ashes, sand, &c.,which in the use of sawdust fuel and the like chokes up the air-spacesby baking fast to the bearing-bar. The object of the flanged-topcross-bars with slightly tapering sides is to afford an easier andbetter means for removing clinkers, 820.

By constructing the cross-ribs at right angles to the bearing-bar I amenabled to cast the whole grate in one piece, and thus make a grate-barwith less labor and expense than would be the case if the cross-ribswere curved, when it becomes necessary to form the grate in segments,from the fact that the curvature of the crossribs renders coringdifficult and tedious.

\/Vhen it is desired to place two or more bars side by side, the ends ofthe cross-bars of one grate-bar come opposite the spaces of theadjoining gratebar, so as to break joints therewith, and thus permit theair to pass freely between the ends of the crossbars, thereby keepingthem cool.

Having thus described my invention and set forth its peculiaradvantages, what I claim is- A grate-bar consisting of a longitudinalbearing-bar, a, with recesses c, and straightlined cross-bars b, withgrooved and flanged top and slightly downwardly tapering sides extendingat right angles from both sides of the bearing-bar and disconnected attheir outer ends, the cross-bars at one side breaking joints with thoseat the other side, and the grooves thereon connecting with the recessesin the bearing-bar, substantially as described, and for the purposespecified.

This specification signed and witnessed this 16th day of September,1880.

THOMAS MAITLAN D.

Witnesses:

JAS. M. W001), JOHN M. HAYES.

